TLE4963-2M datasheet(19/91 Pages) INFINEON

19 / 91 page

XENSIV™ sensors in

hybrid powertrains

Signal output by the crankshaft sensor when driving in

electric mode

This function enables every crankshaft vibration to be

captured with the corresponding signals for forward and

backward movement without the crankshaft sensor incor-

rectly responding to supposed changes to the mechanical

setup such as a shift in the air gap or some other mechani-

cal misalignment.

Collectively, the algorithms named here enable the move-

ments of the crankshaft trigger wheel to be accurately

observed and tracked. The engine control unit knows at all

times which stroke each piston is on and how much time is

left until the next ignition (based on the crankshaft angle).

If the algorithms are correctly aligned, the system will

operate correctly, ensuring that the engine warning light

stays off.

As the crankshaft sensor always provides reliable infor-

mation, the sizing of components required to restart the

combustion engine can be reduced. The starter generator

usually turns the crankshaft for several rotations until the

home position of the crankshaft has been detected and a

minimum rotational speed in excess of several hundred

rotations has been reached. With an advanced crankshaft

sensor, the fuel can be injected and ignited in just half a

rotation. Starting the engine in this way requires only a

fraction of the battery energy needed for a cold start.

Manufacturers can thus choose between a longer service

life for the starter and battery, or size down and save costs

and weight, which – in turn – translates into a slight drop in

consumption.

This design also enables a great driving experience as the

combustion engine starts easily and smoothly without

creating any negative impressions.

As part of its XENSIV™ family of sensors, Infineon

Technologies has developed active Hall sensors specifically

for camshaft and crankshaft applications. These devices

can help to optimize the drive experience while extend-

ing service life. Installed on the camshaft, the XENSIV™

TLE4929C, for instance, can compensate for production

and assembly tolerances on the supplier and manufactur-

er sides thanks to its programmable switching threshold.

This ability means that this position sensor improves angle

accuracy on both on the camshaft and the crankshaft.

First of all, it should be noted here that differential Hall

sensors, by their very physical nature, only switch when

the centerline of the tooth is in front of the sensor. Starting

from the centerline of the tooth and moving out, the follow-

ing tolerances must be taken into account:

› Mechanical tolerances on the tooth itself cause the mag-

netic center to deviate from the mechanical center

› Mechanical assembly tolerances for the module on the

engine block account for the largest deviation

› Mechanical installation tolerances for the magnet and

sensor in the module also have to be added

› It goes without saying that the installed magnets are not

100% homogenous; nor are they magnetized at a perfect

90° angle

› Finally, there are also electrical tolerances within certain

limits that are attributable to the sensor manufacturer.

Improved crankshaft sensor enables other components to last longer

More precise switching points with differential camshaft sensor

TLE4963-2M Datasheet(PDF) 19 Page - Infineon Technologies AG

TLE4963-2M Datasheet(HTML) 19 Page - Infineon Technologies AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91

Datasheet Download

Link URL